From what I have read & seen on other builds, most are located in the middle of the long pipe running along the rad. Right in the area of the alternator, give or take. Thats where I positioned mine. The blade style MAF is sensitive. If you don't have a screen or "honeycomb" before the MAF, I would add one. You might be ok leaving it there, but if you have any tuning issues it might need to be relocated. Looks like you have a nice build going there.
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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